Electrical condenser



y 1934- A. M. KNUDSEN 1,960,944

Patented May 29,1934

UNITED STATES ELECTRICAL commnsnn Anton M. Knudsen, Oak Park, m,assignor to Kellogg Switchboard and Supply Company,

Chicago, 111., a corporation of Illinois 7 Application March 20, 1931,Serial No. 524,091

' Claims. (01.175-41) My invention relates to electrical condensers, andmore particularly to those known as fixed capacity condensers, and whichare composed of sheets of tin or aluminum foil and sheets of paper 5 orother insulation between the sheets of foil, all wound on a suitablecore and provided with suitable terminals.

An object of my invention'is to manufacture such condensers more quicklyand cheaply than has been possible heretofore.

A further object of my invention is to provide such a condenser havingterminals which are 1 more solidly connected to the sheets of foil thanis possible with other condensers.

A feature of my invention is the use of terminals soldered or otherwisefixed, one at each end of the condenser, and extending entirely throughthe. condenser, through insulated tubes, and out at the opposite ends ofthe condenser. Another feature of my invention is the use of a specialmandrel or reel for winding the sheets of foil and insulation on thecore.

Other features will be more fully described in the ensuing specificationand claims.

It is believed that the invention will be more easily understood from adetailed description, taken in connection with the accompanying drawing,in which:

Fig. 1 is a view of the core and terminals 01 the condenser of myinvention, showing sheets of paper and foil ofi'set at the ends, orstaggered;

Fig. 2 is a perspective view of a finished condenser, before beingcoated with wax or other insulating material;

winding mandrel; and

Fig. 4 is a perspective view of the other part of the mandrel. The coreconsists of two hollow tubes 10 and 11, which may be made of paper orany suitable insulating material. These tubes are placed with the endsoflset, as is clearly illustrated in Fig. 1 of the drawing. The sheetsof foil 16 and 18 and the sheets of paper 17 and 19 are so placedthatone sheet of foil extends beyond the edge of the paper and the endof the-inner tube at one end of the condenser as, for instance, thesheet of foil 16 extends beyond the edges of the paper 17 and 19 and theend of the tube 10 as shown at the left side of Fig. 1. The sheet offoil 16 does not, however, extend to the end of tube 11 at this end.

At the other end of the condenser, as at the right .side of Fig. 1, thesheet of foil 16 extends to a point short of the end of tube 11. Thesheet of foil 18 is similarly placed, but at the opposite Fig. 3 is aperspective view of one part of the end of the condenser. The sheets ofpaper 17 and 19 are of a width to extend substantially from the innerend of one tube to the inner end of the other, or cover only that partof the condenser which has the. two tubes adjacent.

The contact wires 12 and 13 extend through the tubes 10 and 11, in amanner which will be explained. 1

It will now be seen that each of the sheets of foil 16 and 18 isinsulated from the other at all points by the sheets of paper, and -fromthe contact wires 12 and 13 by'the tubes 10 and 11. The sheets of foiland paper may be of any length necessary to obtain the desired capacity,and are wound on the two tubes as a core, in a manner well understood inthe art.

After being rolled to the desired size, the condenser may be coveredwith other sheets of paper, for further protection and insulation.

Each-of the contact wires 12 and 13 is bent approximately to a rightangle at one end, as at 14 and 15 respectively. The' wires 12 and 13 areslipped through the tubes 10 and 11, respectively, until the bent endsthereof are pressed into the layers of foil which extend beyond the endsof the tubes 10 and 11, and soldered or otherwise afflxed to the foil,as shown at 15 of Fig. 2. The other ends of the contact wires may beprovided 'with any convenient tip or binding post.

After being completed, the entire condenser .may be covered with wax andinserted in a container, as is'well understood in the art.

In Figs. 3 and 4 of the drawing I have shown a preferred form of mandrelfor winding the condenser of my invention. I

A cylinder 20 is provided with the two cylindrical rods 21 and 22, of asize adapted to fit inside the tubes 10 and 11. The rod 22 is providedwith an enlarged portion 23 at the end nearest the body portion 20.

A second cylinder 24 is provided with a cylindrically shaped extension26 and two orifices 25 adapted to receive the free ends of the rods 21and 22. One of said orifices extends through the member 26 and receivesthe rod 21 in Fig. 3.

J In winding condensers, tubes 10 and 11 are placed over the rods 21 and22. The tube which is placed on rod 21 is positioned against the bodyportion 20, and the tube placed onrod 22 is positioned against theenlarged portion 23. The tubes are thus offset or staggered. The freeends of rods 21 and 22 are then placed in the orifices 25 in such amanner that the extension 26 of cylinder 24 engages the end of theinsulating tube on the rod 21 and holds the other end of the tubeagainst the face or the cylinder 20 while the enlarged portion 23 holdsthe other tube against the face of member 24. The mandrel is placed in awinding machine, by which the strips of paper and foil are wound ontothe tubes, in a manner well understood in the art;

When the winding has been completed, the mandrel is removed from thewinding machine and disassembled, and the condenser removed from therods 21 and 22. The contact wires 12 and 13 are then inserted throughthe tubes and soldered in place, as previously described.

It will now be seen that by the use of very simple and cheap materialand mechanism I am able to make a condenser of almost any desired sizeand capacity, more quickly and easily than has heretofore been possible.

While I have illustrated and described a pre ferred embodiment of myinvention, it is to be understood that changes and modifications willsuggest themselves to those skilled in the art, and I therefore desireto be limited only by the spirit and scope of the appended claims.

Having described my invention, what I claim as new and desire to secureby United States Letters Patent is:

1. In an electrical condenser, a core consisting of a pair of offsetinsulating tubes, a pair of oiTset metallic foil sheets, a plurality ofinsulating sheets separating said foil sheets, said foil and saidinsulating sheets being wound-around said core, and terminal wires, oneextending through each of said tubes, said wires being ailixed to saidtoil sheets, respectively at opposite edges thereof.

2. In an electrical condenser, a core comprising a plurality of offsetinsulating tubes, a plurality of oflset conducting sheets wound aroundsaid core, insulating sheets between said conducting sheets forinsulating said conducting sheets from each other, and terminal wiresextending through said tubes, respectively, each of said wires beingattached tonne of said conducting sheets at opposite edges of saidsheets.

3. An electrical condenser comprising offset insulating tubes, alternatesheets of conducting and insulating material wound on said tubes, andterminal wires extending through said tubes and connected to saidconducting sheets, respectively at opposite edgesthereof.

4. In an electrical condenser, offset insulating tubes, oiIset sheets ofconducting material wound on said tubes, sheets of insulating materialbetween said conducting sheets, and terminal wires extending throughsaid tubes and connected to said conducting sheets at opposite edges ofsaid sheets.

5. An electrical condenser comprising oii'set insulating tubes,alternate sheets of conducting and insulating material wound thereon,and terminals connected to said conducting sheets, respectively atopposite edges thereof. ANTON M. KNUDSEN.

